Electric floor push-button.



H. F. KEIL.

ELECTRIC FLOOR PUSH BUTTON.

APPLICATION FILED MAR. 3, 190a.

9@3,577o Patented Nov. 10, 1908.

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HENRY FnANoisKEIL, or neonxviLL-n, new YORK.

Emo'rmo moon rom-on.

Specification of Letters Patent.

7 .Patented'Nov. 10, 1908.

Application filed March a, 1908. Serial No. 419,010.

and in particular to a knob or plunger by pushing or pressing which the circuit of an electric bell or other electrical apparatus may be completed, and adapted to be affixed to the floor or other suitable supporting structure,.and it has for its object the provision of an article of the class described, simple in construction, inexpensive to manufacture, and which is durable and efficient in practical use.

To attain the desired end the invention consists in the combination, arrangement and operation of parts herein set forth.

In order to enable the invention to be fully understood, I shall proceed to explain the same by reference to the, drawings, illustrative of one embodiment of the invention, which accompany and form a part of this specification, and in which Figure 1 represents a sectional view of a device constructed according to my invention, Fig. 2 is a section taken through the insulating body of the push button, Fig. 3 is a detail of my retaining plate, and Fig. 4 is a side elevation of the device.

Like. letters of reference indicate parts in all the views.

Referring particularly by reference symbols or characters to the drawings, A denotesa face plate constructed and arranged to be secured to the floor, and formed with acentral orifice a, and outer orifices a.

B designates a preferably cylindrical body of insulating material having a central bore 1 and a lower contracted neck b, and Dis a plate constructed and arranged. to lie beneath said cylindrical body and formed with threaded apertures 03 and also ordinarily having recessed portions d Screws E, which preferably lie in grooves D b located in the body B serve to hold the plate D and intermediate body B rigidly to the face plate A, whereby the said body B like is not only held firmly in position, but is adapted to resist any strain which it may be caused to bear. p

A pin F works in the central orifice or bore a of thedevice and is ordinarily made with a shoulder on, which rests a thimble or sleeve f .which latter, together with the 'plun er, is held in an elevated normal position by the spring f" working in the bore b, any undue upward movement of the said thimble being prevented by an annular flange formed on the top of the said open thimble' which is somewhat larger than the bore a, which flange rests against the lower surface of the face plate A.

Two spring fingers C are ordinarily screwed to the exterior of the' cylindrical body B by screws C, which also serve for means of attachment thereto of the wires of the electric circuit.

The ends of the spring fingers C are constructed and arranged to be normally separated by a dielectric medium, as the atmosphere, but to be electrically connected by means of the lower end of the plunger F when it is forced down between the two said spring fingers upon pressing the head of the plunger, which normally stands a little above the surface of the floor.

.In operation, the push buttonlis placed in proper position in the fioor,.and the wires of the electric circuit are fastened to the sprin will be soun ed, and upon releasing the pressure on the plunger, the latter will be re stored to its normal elevated position by means of the resilience of thespring by which it is sustained. a

I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described, for, obviousl modifications will occur to a person skille in the art.

What I claim as my invention is:

1. A face plate having a central orifice, a body made of dielectric material having a 'bore with a contracted neck to register with the said orifice, a spring in said bore adapted said thimble, two converging spring fingers mountedon the insulating body, a shouldered plunger'to rest on the thimble and to work in the said contracted neck, a retaining plate located beneath the insulating body,,and screws passing through the face plate and secured to the said retaining plate.

2. A face plate,-a plunger, two spring fingers, a body made ofdielectrio material to support the same, a retaining plate located below the insulating body, and screws to fasten together the face plate and the retaining plate. I

3. A face plate, two spring fingers, a body made of dielectric material to support the same,- and having a bore and two exterior grooves, a retaining plate located below the 'insulating body, a plunger to work in the said bore and screws placed in the said grooves intermediate the face plate and the retaining plate to fasten the two together.

In testimony of the foregoing specification 1 HENRY FRANCIS KEIL.

Witnesses:

\ CHAs. H. ARENDT, I RICHARD HALL. 

